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;;; Consfigurator -- Lisp declarative configuration management system
;;; Copyright (C) 2021 Sean Whitton <spwhitton@spwhitton.name>
;;; This file is free software; you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3, or (at your option)
;;; any later version.
;;; This file is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;; You should have received a copy of the GNU General Public License
;;; along with this program. If not, see <http://www.gnu.org/licenses/>.
(in-package :consfigurator.connection.setuid)
(named-readtables:in-readtable :consfigurator)
(defun setuid (uid)
#+sbcl (sb-posix:setuid uid)
#-(or sbcl) (foreign-funcall "setuid" :unsigned-int uid :int))
(defun setgid (gid)
#+sbcl (sb-posix:setgid gid)
#-(or sbcl) (foreign-funcall "setgid" :unsigned-int uid :int))
(defclass setuid-connection (rehome-connection fork-connection)
((uid :type :integer :initarg :uid)
(gid :type :integer :initarg :gid)
(home :type :string :initarg :home)))
(defmethod establish-connection ((type (eql :setuid)) remaining &key to)
(unless (and (lisp-connection-p) (zerop (foreign-funcall "geteuid" :int)))
(error "~&SETUIDing requires a Lisp image running as root"))
(informat 1 "~&SETUIDing to ~A" to)
(re:register-groups-bind ((#'parse-integer uid gid))
(#?/uid=([0-9]+).+gid=([0-9]+)/ (mrun "id" to))
(let ((home (user:passwd-entry 5 uid))
(datadir
(ensure-directory-pathname
(stripln
(mrun
"su" to "-c"
"echo ${XDG_CACHE_HOME:-$HOME/.cache}/consfigurator/data/")))))
(continue-connection
(make-instance
'setuid-connection :uid uid :gid gid :datadir datadir :home home)
remaining))))
(defmethod post-fork ((connection setuid-connection))
;; TODO Set up the new environment more systematically. Perhaps look at how
;; runuser(1) uses PAM to do this.
(with-slots (uid gid home datadir) connection
(run-program (list "chown" "-R"
(format nil "~A:~A" uid gid)
(unix-namestring datadir)))
(unless (zerop (setgid gid))
(error "setgid(2) failed!"))
(unless (zerop (setuid uid))
(error "setuid(2) failed!"))
(setf (getenv "HOME") home)
(uiop:chdir home)))
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